文献类型：期刊文献

英文题名：Chemical speciation and structure of lithium (Li) in coal gasification fine slag: Evolution mechanisms and implications for Li recovery

作者：Fu, Biao[1,2,3];Wu, Xia[1,2];Yu, Chengxiang[1,2];Zhou, Xinru[1,2];Nan, Hongyan[1,2];Cao, Yijun[1,2,3];Huang, Yukun[1,2,3];Gao, Yuhang[4];Hu, Guangqing[4];Shen, Zhongjie[5,6];Rong, Lingkun[7]

机构：[1]Zhengzhou Univ, Sch Chem Engn, Zhongyuan Crit Met Lab, Zhengzhou 450001, Peoples R China;[2]Zhengzhou Univ, State Key Lab Crit Met Beneficiat Met & Purificat, Zhengzhou 450001, Peoples R China;[3]Zhengzhou Univ, Key Lab Adv Drug Preparat Technol, Minist Educ, Zhengzhou 450001, Peoples R China;[4]Explorat Res Inst Anhui Coalfield Geol Bur, Anhui Green Mine Engn Res Ctr, Hefei 230088, Peoples R China;[5]East China Univ Sci & Technol, Natl Energy Coal Gasificat Technol Res & Dev Ctr, Shanghai 200237, Peoples R China;[6]East China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, Shanghai 200237, Peoples R China;[7]Inner Mongolia Univ Sci & Technol, Sch Min & Coal, Baotou 014010, Inner Mongolia, Peoples R China

年份：2026

卷号：415

外文期刊名：FUEL

收录：;EI(收录号：20260419964781);WOS:【SCI-EXPANDED(收录号:WOS:001678397200001)】；

基金：This work was supported by National Key R&D Program of China (2023YFB4103502), National Natural Science Foundation of China (42472233), Project of Anhui Green Mine Engineering Research Center (AGMERC-23KF-01), and Project of Anhui Provincial Intelligent Underground Detection and Geoenvironmental Engineering Research Center (APIUDGERC23KF03), and Inner Mongolia Natural Science Foundation (No. 2023MS05010) and Basic research business fees for universities in Inner Mongolia Autonomous Region (No.2023QNJS104).

语种：英文

外文关键词：Coal gasification fine slag (CGFS); Lithium distribution; Aluminosilicate glass; Evolution mechanism; Resource recovery

摘要：Lithium (Li) recovery from coal gasification fine slag (CGFS) offers a promising solution to waste management while providing an alternative Li source to conventional ores. Developing efficient extraction technologies requires a thorough understanding of Li's physical distribution and chemical speciation within CGFS. This study investigated two CGFS samples with contrasting compositions to elucidate Li distribution and incorporation mechanisms. Results show an inverse correlation between particle size and Li concentration, while loss on ignition (LOI) exhibits a positive correlation with particle size. Both slags are predominantly composed of aluminosilicate glass, which hosts over 90% of total Li. However, Li speciation varies significantly: similar to 83.7% of Li is readily leachable from the high-carbon, Ca-Fe-rich sample, compared to <25% in the low-carbon, Si-Al-rich sample. Time-of-flight secondary ion mass spectrometry (TOF-SIMS) and nuclear magnetic resonance (NMR) analysis reveal that Li is mainly distributed within Ca-, Na-, and K-bearing glassy particles, composed of four aluminosilicate configurations: Q(4)(0Al) to Q(4)(3Al). Theoretical calculations confirm LiOH (g) as the dominant volatile species under gasification conditions (>1400 degrees C, CO2/H2O(g) atmosphere) and demonstrate its preferential incorporation into Q(4) (3Al) units via exothermic Si-O-Si bond cleavage (Delta E = - 217.47 kJ/mol) rather than Si-O-Al scission. These findings underscore that tailored Li recovery strategies must account for the specific distribution and structural speciation of Li within the CGFS glass matrix, highlighting the importance of fundamental material characterization in recovery process design.